3 ADMINISTRATIVE RULES

SOAHR #2006-013

DEPARTMENT OF LABOR AND ECONOMIC GROWTH PUBLIC SERVICE COMMISSION

TECHNICAL STANDARDS FOR ELECTRIC SERVICE

Filed with the Secretary of State on May 21, 2008

These rules become effective immediately upon filing with the Secretary of State unless adopted under sections 33, 44, 45a(6), or 48 of 1969 PA 306. Rules adopted under these sections become effective 7 days after filing with the Secretary of State.

(By authority conferred on the public service commission by section 7 of 1909 PA 106, section 5 of 1919 PA 419, and sections 4 and 6 of 1939 PA 3, MCL 460.557, 460.55, 460.4, and 460.6.)

R 460.3306, R 460.3401, R 460.3402, R 460.3403, R 460.3404, R 460.3406, R 460.3407, R 460.3901, R

460.3902, R 460.3903, R 460.3904, R 460.3905, R 460.3906, R 460.3907 and R 460.3908 of the

Michigan Administrative Code are rescinded, R 460.3102, R460.3308, R 460.3602, R 460.3605, R 460.3607, R 460.3609, R 460.3610, R 460.3612, and R 460.3613 of the Code are amended, and R 460.3204 and R 460.3309 are added to the Code as follows:

R 460.3102 Definitions.

Rule 102. As used in these rules:

(a) "Acceptable to the commission" means that a commission order has been obtained.

(b) "Approved by the commission" means that a commission order has been obtained.

(d) "Customer," except as used in R 460.3411, means any person, firm, association, or corporation, or any agency of the federal, state, county, or municipal government that purchases electric service supplied by a utility.

(e) "Electric plant" means all real estate, fixtures, or property that is owned, controlled, operated, or managed in connection with, or to facilitate the production, transmission, and delivery of, electric energy.

(f) "File" means to deliver to the commission's executive secretary.

(g) "Meter," unless otherwise qualified, means a device that measures and registers the integral of an electrical quantity with respect to time.

(h) "Metering error" means a failure to accurately measure and record all of the electrical quantities that are required by the applicable rate or rates.

(i) "Meter shop" means a shop where meters are inspected, repaired, and tested. A meter shop may be at a fixed location or may be mobile.

(j) "Premises" means an undivided piece of land that is not separated by public roads, streets, or alleys.

(k) "Submit" means to deliver to the commission's designated representative.

(l) "Utility" means an electric company, whether private, corporate, or cooperative, that operates under the jurisdiction of the commission.

R 460.3204 Customer records; retention period; content.

Rule 204. (1) The utility shall retain records as necessary to comply with R 460.3309. The records shall be retained for not less than 3 years.

(2) Records for customers shall show, if applicable, all of the following information:

(a) Kilowatt-hour meter reading.

(b) Kilowatt-hour consumption.

(d) Kilowatt, kilovolt ampere, and kilovar measured demand.

(e) Kilowatt, kilovolt ampere, and kilovar billing demand.

(f) Total amount of bill. R 460.3306 Rescinded.

R 460.3308 Standards of good practice; adoption by reference.

Rule 308. In the absence of specific rules of the commission, a utility shall apply the provisions of the publications set forth in this rule as standards of accepted good practice. The following standards are available from the American National Standards Institute (ANSI), Customer Service, 25 West 43rd St., 4th floor, New York, New York, 10036, USA, telephone number: 1-212-642-4900 or via the internet at web-site: http://webstore.ansi.org/ansidocstore/; at the cost listed below as of the time of adoption of these rules, plus a handling charge (for paper copies):

(a) American National Standards Institute standards for electricity meters ANSI C12.1-2001 and C12.20-2002. Cost $120.00.

(b) American National Standards Institute/American Society for Quality Sampling Procedures and Tables for Inspection by Variables for Percent Nonconforming (ANSI/ASQ Z1.9-2003). Cost $100.00.

(c) American National Standards Institute IEEE Standard Requirements for Instrument Transformers (ANSI C57.13-1993). Cost $110.00.

(d) American National Standards Institute IEEE Standard for High Accuracy Instrument Transformers, IEEE Std. C57.13.6-2005. Cost $35.00.

(e) The standards adopted in subdivisions (a) to (d) of this rule are also available for inspection at the Michigan Public Service Commission, 6545 Mercantile Way, P.O. Box 30221, Lansing, Michigan, 48909. Copies of these standards may also be obtained from the MPSC at the cost charged by ANSI, plus $20.00 for shipping and handling.

R 460.3309 Metering inaccuracies; billing adjustments.

Rule 309. (1) An adjustment of bills for service for the period of inaccuracy shall be made for over registration and may be made for under registration under any of the following conditions:

(a) If a meter creeps.

(b) If a metering installation is found upon any test to have an average inaccuracy of more than 2.0%.

(c) If a demand metering installation is found upon any test to have an average inaccuracy of more than 1.0% in addition to the inaccuracies allowed under R 460.3609.

(d) If a meter registration has been found to be inaccurate due to apparent tampering by a person or persons known or unknown.

(2) The amount of the adjustment of the bills for service shall be calculated on the basis that the metering equipment is 100% accurate with respect to the testing equipment used to make the test. The average accuracy of watt-hour meters shall be calculated in accordance with R 460.3616.

(3) If the date when the inaccuracy in registration began can be determined, then that date shall be the starting point for determining the amount of the adjustment and shall be subject to subrule (12) of this rule.

(4) If the date when the inaccuracy in registration began cannot be determined, then it is assumed that the inaccuracy existed for the period of time immediately preceding discovery of the inaccuracy that is equal to 1/2 of the time since the meter was installed on the present premises, 1/2 of the time since the last test, or 6 years, whichever is the shortest period of time, except as otherwise provided in subrule (5) of this rule and subject to subrule (12) of this rule.

(5) The inaccuracy in registration due to creep shall be calculated by timing the rate of creeping under R 460.3607 and by assuming that the creeping affected the registration of the meter for the period of time immediately preceding discovery of the inaccuracy that is equal to 1/4 of the time since the meter was installed on the present premises, 1/4 of the time since the last test, or 6 years, whichever is the shortest period of time, subject to subrule (12) of this rule.

(6) If the average inaccuracy cannot be determined by test because part, or all, of the metering equipment is inoperative, then the utility may use the registration of check metering installations, if any, or estimate the quantity of energy consumed based on available data. The utility shall advise the customer of the metering equipment failure and of the basis for the estimate of the quantity billed. The same periods of inaccuracy shall be used as explained in this rule.

(7) Recalculation of bills shall be on the basis of the recalculated monthly consumption.

(8) If the recalculated bills indicate that an amount is due an existing customer or that more than

$10.00 is due a former customer of the utility, then the utility shall refund the full amount of the difference between the amount paid and the recalculated amount.

(9) Refunds shall be made to the 2 most recent customers who received service through the meter found to be inaccurate. If a former customer of the utility, a notice of the amount of the refund shall be mailed to such customer at the last known address. The utility shall, upon demand made by the customer within 3 months of mailing of the notice, forward the refund to the customer.

(10) If the recalculation of billing as a result of a metering inaccuracy indicates that more than $1.00 is owed to the utility by an existing customer or that more than $10.00 is owed to the utility by a former customer, then the utility may issue a bill for the amount, subject to subrule (12) of this rule.

(11) Each utility may establish a policy setting a minimum amount for which it may bill a customer due to under registration that is more than the amounts in subrule (10) of this rule. The minimum amount established in the utility policy shall be applied in all cases of under registration to determine whether the customer will be billed for the amount due the utility because of under registration.

(12) Except in cases of tampering, back billing of customers for metering inaccuracies is limited to the 2-year period immediately preceding discovery of the inaccuracy. The customer shall be given a reasonable time in which to pay the amount of the back billing, after consideration of the amount of the back bill and the duration of the inaccuracy, and service shall not be shut off during this time for nonpayment of the amount of the back billing if the customer is complying with the repayment agreement.

PART 4. EXTENSION OF SERVICE

R 460.3401 Rescinded.

R 460.3402 Rescinded.

R 460.3403 Rescinded.

R 460.3404 Rescinded.

R 460.3406 Rescinded.

R 460.3407 Rescinded.

R 460.3602 Meter and associated device inspections and tests; certification of accuracy.

Rule 602. Every meter shall be inspected and tested, and associated device(s) shall be inspected, in the meter shop of the utility, or a meter testing facility certified by the utility, before being placed in service. The accuracy of each meter shall be certified to be within the tolerances permitted by these rules, except that the utility may rely on the certification of accuracy by the manufacturer on all new meters.

R 460.3605 Metering electrical quantities.

Rule 605. (1) All electrical quantities that are to be metered as provided in R 460.3301 shall be metered by commercially acceptable instruments which are owned and maintained by the utility.

(2) Every reasonable effort shall be made to measure at 1 point all the electrical quantities necessary for billing a customer under a given rate.

(3) Metering facilities located at any point where energy may flow in either direction and where the quantities measured are used for billing purposes shall consist of meters equipped with ratchets or other devices to prevent reverse registration and shall be so connected as to separately meter the energy flow in each direction, unless used to implement a utility tariff approved by the commission for service provided under a net metering program.

(4) Reactive metering shall not be employed for determining the average power factor for billing purposes where energy may flow in either direction or where the customer may generate an appreciable amount of his or her energy requirements at any time, unless suitable directional relays and ratchets are installed to obtain correct registration under all conditions of operation.

(5) All electric service of the same type rendered under the same rate schedule shall be metered with instruments having like characteristics, except that the commission may be requested to approve the use of instruments of different types if their use does not result in unreasonable discrimination. Either all of the reactive meters which may run backwards or none of the reactive meters used for measuring reactive power under 1 schedule shall be ratcheted.

R 460.3607 Watt-hour meter requirements.

Rule 607. (1) Watthour meters that are used for measuring electrical quantities supplied shall conform to ANSI specifications and meet all of the following requirements:

(a) Be of proper design for the circuit on which the meters are used; be in good mechanical and electrical condition; and have adequate insulation, correct internal connections, and correct register.

(b) Not creep at no load with all load wires disconnected at a rate of one complete revolution of the moving element in ten minutes when potential is impressed.

(c) Be accurate to within plus or minus 1.0%, referred to the portable standard watthour meter as a base, at two unity power factor loads: light load (l.l.) and heavy load (h.l.).

Meter Must be Accurate within ± 1.0% to Portable Standard
Meter Class	Light Load Test	Heavy Load	Inductive Load

	Amperes	Test Amperes	50% Lagging Power Factor Test Amperes
Self-	10% Rated	75-	75-100%
Contained	Test	100%	Rated Test
	Amperes	Rated	Amperes of
	of Meter	Test	Meter
		Amperes
		of Meter
Transformer	5-10%	75-	75-100%
Rated	Rated Test	100%	Rated Test
	Amperes	Rated	Amperes of
	of Meter	Test	Meter
		Amperes
		of Meter

(d) Be accurate to within plus or minus 2.0%, referred to the portable standard watthour meter as a base, at inductive load (i.l.).

(2) Polyphase meters shall have their elements in balance within 2.0% at rated test amperes at unity power factor and at approximately 50% lagging power factor.

(3) Meters that are used with instrument transformers shall be adjusted so that the overall accuracy of the metering installation meets the requirements of this rule.

(4) Meters and associated devices shall be adjusted as close as practical to zero error and within the accuracy limits specified in subrule (1)(c) of this rule.

R 460.3609 Instrument transformers used in conjunction with metering equipment; requirements; phase shifting transformers; secondary voltage.

Rule 609. (1) Instrument transformers used in conjunction with metering equipment to measure a customer's service shall meet both of the following requirements:

(a) Be in proper mechanical condition and have satisfactory electrical insulation for the service on which used.

(b) Have characteristics such that the combined inaccuracies of all transformers supplying 1 or more meters in a given installation will not exceed the percentages listed in the following chart:

	100% Power Factor		50% Power Factor
Current	10%	100%	10%	100%
Error	1%	0.75%	3%	2%

(2) Meters that are used in conjunction with instrument transformers shall be adjusted so that the overall accuracies will come within the limits specified in this part.

(3) Instrument transformers shall be tested with the meter with which they are associated by making an overall test or may be checked separately. If the transformers are tested separately, the meters shall

also be checked to see that the overall accuracy of the installation is within the prescribed accuracy requirements. (See R 460.3613 (6).)

(4) The results of tests of instrument transformers shall be kept on record and shall be available for use.

(5) Phase shifting transformers shall have secondary voltages under balanced line voltage conditions within plus or minus 1.0% of the voltage impressed on the primary side of the transformer.

R 460.3610 Portable indicating voltmeters; accuracy.

Rule 610. All portable indicating voltmeters that are used for determining the quality of service voltage to customers shall be checked against a suitable secondary reference standard at least once every 6 months for analog devices, and once every 12 months for digital devices. The accuracy of these voltmeters shall be rated so that the error of the indication is not more than plus or minus 1% of full scale. If the portable indicating voltmeter is found to be in error by more than the rated accuracy at commonly used scale deflections, it shall be adjusted.

R 460.3612 Test standards; accuracy.

Rule 612. (1) The accuracies of all primary reference standards shall be certified as traceable to the National Institute of Standards and Technology (NIST), either directly or through other recognized standards laboratories. These standards shall have their accuracy certified at the time of purchase.

Standard cells shall be intercompared regularly and at least 1 standard cell shall be checked by a standardizing laboratory at intervals of not more than 2 years. Reference standards of resistance, potentiometers, and volt boxes shall be checked at intervals of not more than 3 years.

(2) Secondary watthour meter standards shall not be in error by more than plus or minus 0.3% at loads and voltages at which they are to be used, and shall not be used to check or calibrate working standards, unless the secondary standard has been checked and adjusted, if necessary, within the preceding 6 months. Each secondary standard watthour meter shall have calibration data available and shall have a history card.

(3) Secondary standards indicating instruments shall not be in error by more than plus or minus 0.5% of indication at commonly used scale deflection and shall not be used to check or calibrate portable indicating instruments, unless the secondary standard has been checked and adjusted, if necessary, within the preceding 12 months. A calibration record shall be maintained for each standard.

(4) Regularly used working portable standard watthour meters shall be compared with a secondary standard at least once every 6 months. Infrequently used working standards shall be compared with a secondary standard before they are used.

(5) Working portable standard watthour meters shall be adjusted so that their percent registration is within 99.7% and 100.3% at 100% power factor and within 99.5% and 100.5% at 50% lagging power factor at all voltages and loads at which the standard may be used. A history and calibration record shall be kept for each working standard.

(6) The meter accuracies required in this rule for all primary, secondary, and working standards shall be referred to 100%. Service measuring equipment shall be adjusted to within the accuracies required assuming the portable test equipment to be 100% accurate with the calibration correction taken into consideration.

R 460.3613 Metering equipment testing requirements.

Rule 613. (1) The testing of any unit of metering equipment shall consist of a comparison of its accuracy with a standard of known accuracy. Units which are not properly connected or which do not meet the accuracy or other requirements of these meter and metering equipment rules at the time of

testing shall be reconnected or rebuilt to meet such requirements and shall be adjusted to within the required accuracy and as close to zero error as practicable or else their use shall be discontinued.

(2) Self-contained, single-phase meters, except for combination meters (meters that include demand devices or control devices), shall be in compliance with all of the following requirements:

(a) Be checked for accuracy at unity power factor at the point where a meter is installed, at a central testing point, or in a mobile testing laboratory within a period of from 12 months before, to 60 days after, a meter is placed in service, except as provided for in R 460.3602, and in subrule (3) of this rule, and not later than 9 months after 192 months of service for a surge-resistant meter and not later than 9 months after 96 months of service for a non-surge-resistant meter.

(b) Notwithstanding the provisions of subdivision (a) of this subrule, upon application to the commission and upon receipt of an order granting approval, the testing of self-contained, single-phase meters in service shall be governed by a quality control plan as follows:

(i) Meters shall be divided into homogeneous groups by manufacturers' types, except as follows:

(A) Certain manufacturers’ types shall be further subdivided into separate groups by manufacturers' serial numbers as follows:

(1) General Electric type I-30 shall be divided at serial number 20,241,829.

(2) Westinghouse type C shall be divided at serial number 16,350,000.

(3) Duncan type MF shall be divided at serial number 2,650,000.

(4) Sangamo type J meters shall be divided starting with serial number 10,000,000.

(B) Non-surge-resistant meters that are installed in nonurban areas shall be treated as separate groups by manufacturers' type.

(ii) The meters in each homogeneous group shall then be further subdivided into lots of not less than 301, and not more than 10,000, meters each, except that meters of the most recent design may be combined into lots regardless of manufacturers' type, except that where the number of meters of a single type is 8,001 or more, that number of meters shall be segregated by types for the formation of lots.

(iii) From each assembled lot, a sample of the size specified in table A-2, ANSI/ASQC Z1.9, shall be drawn annually. The sample shall be drawn at random.

(iv) The meters in each sample shall be tested for accuracy pursuant to the provisions of these rules.

(v) The test criteria for acceptance or rejection of each lot shall be based on the test at heavy load only and shall be that designated for double specification limits and an acceptable quality level (AQL) that is not higher than 2.50 (normal inspection) as shown in table B-3, ANSI/ASQC Z1.9.

(vi) The necessary calculations shall be made pursuant to Example B-3 of ANSI/ASQC Z1.9. The upper and lower specification limits, U and L, shall be 102% and 98%, respectively.

(vii) A lot shall be rejected if the total estimated percent defective (p) exceeds the appropriate maximum allowable percent defective (M) as determined from table B-3 as specified in paragraph (v) of this subdivision.

(viii) All meters in a rejected lot shall be tested within a maximum period of 48 months and shall be adjusted pursuant to the provisions of R 460.3607 or shall be replaced with meters that are in compliance with the requirements of R 460.3607.

(ix) During each calendar year, new meter samples shall be drawn as specified in this subdivision from all meters in service, with the exception that lots that have been rejected shall be excluded from the sampling procedure until all meters included in the rejected lots have been tested.

(x) The utility may elect to adopt a mixed variables-attributes sampling plan as outlined in Section A9 of ANSI/ASQC Z1.9, in which case, a lot that is not in compliance with the acceptability criteria of the variables sampling plan shall be resampled the following year using an attributes sampling plan. If the acceptability criteria of the attributes sampling plan are met, then the lot shall be considered acceptable and shall be returned to the variables sampling plan the following year. If the acceptability criteria of the

attributes sampling plan are not met, then that lot shall be rejected and all meters in the lot shall be tested and adjusted or replaced within a maximum period of 36 months after the second rejection.

(xi) The plan specified in paragraph (x) of this subdivision does not alter the rules under which customers may request special tests of meters.

(i) When a meter is suspected of being inaccurate or damaged.

(ii) When the accuracy of a meter is questioned by a customer. (See R 460.3601.)

(iii) Before use if a meter has been inactive for more than 1 year after having been in service.

(iv) When a meter has been removed from service and has not been tested within the previous 48 months.

(d) Be inspected for mechanical and electrical faults when the accuracy of the device is checked.

(e) Have the register and the internal connections checked before the meter is first placed in service and when the meter is repaired.

(f) Have the connections to the customer’s circuits checked when the meter is tested on the premises or when removed for testing.

(g) Be checked for accuracy at 50% power factor when purchased and after rebuilding.

(h) A meter need not be tested or checked for any reason, except when a complaint is received, if the device was tested, checked, and adjusted, if necessary, within the previous 12 months.

(3) Notwithstanding the provisions of subrules (4)(a)(ii), (5)(a) (ii) and (6)(a)(iii) of this rule, upon application to the commission and upon receipt of an order granting approval, the solid state meters described in subrules (4), (5) and (6) of this rule in service may elect to be governed by a quality control plan as follows:

(a) Meters shall be divided into homogeneous groups by manufacturers’ types.

(b) The meters in each homogeneous group shall then be further subdivided into lots of not less than 301, and not more than 10,000, meters each, except that meters of the most recent design may be combined into lots regardless of manufacturers' type, except that where the number of meters of a single type is 8,001 or more, that number of meters shall be segregated by types for the formation of lots.

(c) From each assembled lot, a sample of the size specified in table A-2, ANSI/ASQC Z1.9, shall be drawn annually. The sample shall be drawn at random.

(d) The meters in each sample shall be tested for accuracy pursuant to the provisions of these rules.

(e) The test criteria for acceptance or rejection of each lot shall be based on the test at heavy load only and shall be that designated for double specification limits and an acceptable quality level (AQL) that is not higher than 2.50 (normal inspection) as shown in table B-3, ANSI/ASQC Z1.9.

(f) The necessary calculations shall be made pursuant to Example B-3 of ANSI/ASQC Z1.9. The upper and lower specification limits, U and L, shall be 102% and 98%, respectively.

(g) A lot shall be rejected if the total estimated percent defective (p) exceeds the appropriate maximum allowable percent defective (M) as determined from table B-3 as specified in paragraph (e) of this subdivision.

(h) All meters in a rejected lot shall be tested within a maximum period of 48 months and shall be adjusted pursuant to the provisions of R 460.3607 or shall be replaced with meters that are in compliance with the requirements of R 460.3607.

(i) During each calendar year, new meter samples shall be drawn as specified in this subdivision from all meters in service, with the exception that lots that have been rejected shall be excluded from the sampling procedure until all meters included in the rejected lots have been tested.

(j) The utility may elect to adopt a mixed variables-attributes sampling plan as outlined in Section A9 of ANSI/ASQC Z1.9, in which case, a lot that is not in compliance with the acceptability criteria of the variables sampling plan shall be resampled the following year using an attributes sampling plan. If the acceptability criteria of the attributes sampling plan are met, the lot shall be considered acceptable and

shall be returned to the variables sampling plan the following year. If the acceptability criteria of the attributes sampling plan are notmet, then that lot shall be rejected and all meters in the lot shall be tested and adjusted or replaced within a maximum period of 36 months after the second rejection.

(k) The plan specified in paragraph (j) of this subdivision does not alter the rules under which customers may request special tests of meters.

(4) All single-phase meters that are not included in the provisions of subrule (2) of this rule, together with associated equipment, such as demand devices, control devices and instrument transformer-rated meters, shall be in compliance with all of the following requirements:

(a) Be checked for accuracy at unity power factor at the point where a meter is installed, at a central testing point, or in a mobile testing laboratory as follows:

(i) Within a period of from 12 months before, to 60 days after, a meter is placed in service, exceptions to this subrule (4)(a) of this rule are as provided for in R 460.3602 and for solid state meters.

(ii) Not later than 9 months after 144 months of service for a surge-resistant meter and not later than 9 months after 96 months of service for a non-surge-resistant meter.

(iii) When a meter is suspected of being inaccurate or damaged.

(iv) When the accuracy of a meter is questioned by a customer. (See R 460.3601.)

(v) Before use when a meter has been inactive for more than 1 year after having been in service.

(vi) When a meter is removed from service and has not been tested within a period equal to 1/2 of the normal test schedule.

(b) Be inspected for mechanical and electrical faults when the accuracy of the device is checked.

(c) Have the register and the internal connections checked before the meter is first placed in service and when the meter is repaired.

(d) Have the connections to the customer’s circuits checked when the meter is tested on the premises or when removed for testing.

(e) Be checked for accuracy at 50% power factor when purchased and after rebuilding.

(f) A meter need not be tested or checked for any reason, except when a complaint is received, if the device was tested, checked and adjusted, if necessary, within the previous 12 months.

(5) All self-contained, 3-phase meters and associated equipment shall be in compliance with all of the following requirements:

(a) Be tested for accuracy at unity and 50% power factor as follows:

(i) Before being placed in service.

(ii) Not later than 9 6 months after 120 months of service.

(iii) When a meter is suspected of being inaccurate or damaged.

(iv) When the accuracy of a meter is questioned by a customer. (See R 460.3601.)

(v) When a meter is removed from service.

(b) Be inspected for mechanical and electrical faults when the accuracy is checked.

(c) Have the register and internal connections checked before the meter is first installed, when repaired and when the register is changed.

(d) Have the connections to the customer’s circuits and multipliers checked when the equipment is tested for accuracy on the customer's premises.

(6) All transformer-rated, 3-phase meters and associated equipment shall be in compliance with all of the following requirements:

(a) Be checked for accuracy at unity and 50% power factor as follows:

(i) Before being placed in service.

(ii) On the customer’s premises within 60 days after installation, unless the transformers are in compliance with the specifications outlined in the American National Standards Institute standard ANSI C-57.13, and unless the meter adjustment limits do not exceed plus or minus 1.5% at 50% power factor.

(iii) Not later than 9 months after 72 months of service.

(iv) When a meter is suspected of being inaccurate or damaged.

(v) When the accuracy is questioned by a customer. (See R 460.3601.)

(vi) When a meter is removed from service.

(b) Be inspected for mechanical and electrical faults when the accuracy is checked.

(c) Have the register and internal connections checked before the meter is first placed in service and when the meter is repaired.

(d) Have the connections to the customer’s circuits and multipliers checked when the equipment is tested for accuracy on the premises or when removed for testing and when instrument transformers are changed.

(e) Be checked for accuracy at 50% power factor when purchased and after rebuilding.

(7) Instrument transformers shall be tested in all of the following situations:

(a) When first received, unless a transformer is accompanied by a certified test report by the manufacturer.

(b) When removed from service.

(d) When there is evidence of damage.

(e) When an approved check, such as the variable burden method in the case of current transformers that is made when the meter is tested indicates that a quantitative test is required.

(8) Demand meters shall be in compliance with both of the following requirements:

(a) Be tested for accuracy in all of the following situations:

(i) Before a meter is placed in service.

(ii) When an associated meter is tested and the demand meter is a block interval nonrecording type or a thermal type.

(iii) After 2 years of service if the meter is of the recording type, but testing is not required if the meter is of the pulse-operated type and the demand reading is checked with the kilowatt-hour reading each billing cycle.

(iv) When a meter is suspected of being inaccurate or damaged.

(v) When the accuracy is questioned by a customer. (See R 460.3601.)

(vi) When a meter is removed from service.

(b) Be inspected for mechanical and electrical faults when a meter is tested in the field or in the meter shop.

R 460.3901 Rescinded.

R 460.3902 Rescinded.

R 460.3903 Rescinded.

R 460.3904 Rescinded.

R 460.3905 Rescinded.

R 460.3906 Rescinded.

R 460.3907 Rescinded.

R 460.3908 Rescinded.

3 ADMINISTRATIVE RULES

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